从一个Activity打开另外一个Activity

public class MainActivity extends Activity {

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

    public void openActivity(View v){

        //打开新的Activity

        Intent intent = new Intent(this, OtherActivity.class);//激活组件,显示意图:明确指定了组件名称的意图叫显示意图

        //关于指定组件名称，还有很多写法

        //1> intent.setClass(this, OtherActivity.class);//指定要激活的组件名称

        //2> intent.setClassName(this, "cn.itcast.activitys.OtherActivity");//还可以激活别的应用的Activity

        //3> intent.setComponent(new ComponentName(this, OtherActivity.class));

        // intent.setClassName(this, "cn.itcast.activitys.OtherActivity");

        /*

        intent.putExtra("company", "传智播客");

        intent.putExtra("age", 5);

        */

        Bundle bundle = new Bundle();

        bundle.putString("company", "CSDN");

        bundle.putInt("age", 11);

        intent.putExtras(bundle);

        //startActivity(intent);

        startActivityForResult(intent, 100);

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        String result = data.getStringExtra("result");

        Toast.makeText(getApplicationContext(),result, 1).show();

        super.onActivityResult(requestCode, resultCode, data);

    }

}

public class OtherActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.other);

        TextView textView = (TextView) this.findViewById(R.id.textView);

        Intent intent = getIntent();//获取用于激活它的意图对象

    /*    String company = intent.getStringExtra("company");

        int age = intent.getIntExtra("age", 0);

    */

        Bundle bundle = intent.getExtras();

        String company = bundle.getString("company");

        int age = bundle.getInt("age");

        textView.setText("公司名称："+ company+ ",年限："+ age);

    }

    public void closeActivity(View v){

        Intent intent = new Intent();

        intent.putExtra("result", "老方与丽丽的故事，后面省略2000字");

        setResult(20, intent);//设置返回数据

        finish();//关闭Activity(关闭窗口)

    }

}